prove that in a group if aba^-1b^-1=e then ab=ba

it is for modern al gebra
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2 Answers

????????????? that dont make sens

a*a^-1*b*b^-1 is (a/a)*(b/b)=1*1=1

it KANT =e
by
aba^-1b-1b=eb

aba^-1e=eb

aba^-1a=ba

abe=ba

ab=ba
by

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